/* ajax.js */

var xmlHttp;
try
  {
  // Firefox, Opera 8.0+, Safari
  xmlHttp=new XMLHttpRequest();
  }
catch (e)
  {
  // Internet Explorer
  try
    {
    xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
    }
  catch (e)
    {
    try
      {
      xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
      }
    catch (e)
      {
      alert("Your browser does not support AJAX!");
      }
    }
  }

function ajax_email(vars) {

  var url = "modules/book_sign_up.php";
  xmlHttp.open("POST",url,true);
  xmlHttp.setRequestHeader("Method", "POST "+url+" HTTP/1.1");
  xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
  xmlHttp.send(vars);
  xmlHttp.onreadystatechange=function()
  {
  if(xmlHttp.readyState==4)
  {
  if(xmlHttp.responseText) {
  disp_('book_sign_up','none');
  disp_('confirm','block');
  }
  else {
  disp_('error','block');
  }
  }
  }
}